Defined Benefit Plans (Components of Net Periodic Benefit Cost of Other Postretirement Benefit Pension Pans) (Details) - USD ($) $ in Millions |
3 Months Ended | 6 Months Ended | ||
---|---|---|---|---|
Jun. 29, 2018 |
Jun. 30, 2017 |
Jun. 29, 2018 |
Jun. 30, 2017 |
|
Defined Benefit Plan Disclosure [Line Items] | ||||
Service cost | $ (11.2) | $ (10.0) | $ (22.1) | $ (19.8) |
Net periodic pension benefit (cost) | (2.9) | (3.0) | (6.0) | (5.9) |
Other postretirement benefit plans | ||||
Defined Benefit Plan Disclosure [Line Items] | ||||
Service cost | (0.2) | (0.2) | (0.3) | (0.4) |
Interest cost | (1.1) | (1.3) | (2.3) | (2.6) |
Amortization of prior service credit | (0.6) | (0.8) | (1.2) | (1.6) |
Net periodic pension benefit (cost) | $ (0.7) | $ (0.7) | $ (1.4) | $ (1.4) |